Investments in Unconsolidated Affiliates - Combined Financial Information of Unconsolidated Affiliated Companies (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Assets:
Current assets	$ 46,824
Noncurrent assets	139,590
Total assets	186,414
Liabilities:
Current liabilities	34,813
Noncurrent liabilities	75,536
Total liabilities	110,349
Results of operations:
Revenue	31,475	17,788
Operating loss	(7,820)	(14,520)
Loss from continuing operations	(5,083)	(9,353)
Net loss	$ (5,083)	$ (9,353)